WO2022037069A1

WO2022037069A1 - Single-roller adjustable manual walnut-shelling machine

Info

Publication number: WO2022037069A1
Application number: PCT/CN2021/083794
Authority: WO
Inventors: 张燕; 许阐; 张辉; 马雨莹
Original assignee: 海南大学
Priority date: 2020-08-21
Filing date: 2021-03-30
Publication date: 2022-02-24
Also published as: CN111838691A; CN111838691B

Abstract

A single-roller adjustable manual walnut-shelling machine, which comprises a housing (1), a hopper (2) and an extrusion device (3); the housing (1) is in communication with the hopper (2), and the extrusion device (3) is provided in the housing (1) and is located below a discharge port of the hopper (2); the extrusion device (3) comprises an extrusion plate (4), an extrusion roller (5) and a turning handle (6); the extrusion roller (5) is fixedly connected to the turning handle (6); the extrusion plate (4) is rotatably connected to the housing (1); the extrusion roller (5) and the extrusion plate (4) form a channel therebetween for extruding walnuts; and an adjustment device (7) which drives the extrusion plate (4) to rotate is provided on the housing (1). The single-roller adjustable manual walnut-shelling machine carries out shelling by means of a manual drive device, has a simple structure, and is suitable for farmers to use. By means of adjusting the size of the walnut-extruding channel, the shelling machine can adapt to walnuts of various sizes.

Description

A single-roller adjustable hand-cranked walnut sheller

technical field

The invention relates to the technical field of walnut shelling, in particular to a single-roller adjustable hand-cranked walnut shelling machine.

Background technique

Walnut is a kind of dried fruit with extremely high nutritional value. In the process, due to its hard shell, breaking the shell and taking the kernels has become a very troublesome walnut processing step. At present, there are walnut shelling machines on the market, most of which are mainly large-scale factory equipment. Such equipment is generally produced for walnut products. The factory is equipped with, the price is not cheap. However, most of the farmers who grow walnuts in our country cannot afford to buy such machines, so they still mainly use manual shelling.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned prior art, the present invention is to provide a single-roller adjustable hand-cranked walnut sheller, which is dehulled by a hand-crank drive device, has a simple structure, and is suitable for farmers to use. The sheller adapts to different sizes of walnuts.

The technical scheme of the present invention is realized as follows:

A single-roller adjustable hand-cranked walnut sheller, comprising a shell, a hopper and an extrusion device, the shell is communicated with the hopper, and the extrusion device is arranged in an outer box and below the discharge port of the hopper , the squeezing device includes a squeezing plate, a squeezing roller and a rocker, the squeezing roller and the rocker are fixedly connected, the squeezing plate and the rocker are respectively rotatably connected to the shell, and the squeezing A channel for squeezing walnuts is formed between the pressing roller and the pressing plate, and the casing is provided with an adjusting device that drives the pressing plate to rotate toward or away from the pressing roller.

Further, the pressing plate is in the shape of an inclined square step, the rotation axis of the pressing roller is parallel to the step of the pressing plate, and the pressing roller is a square cylinder with rounded edges, so The sides of the square cylinder are provided with grooves with inclined bottoms, the bottom depths of the grooves gradually decrease along the rotation direction of the squeezing roller when walnuts are squeezed, and the length of the grooves is the same as the length of the square cylinders.

Further, the adjusting device includes a connecting bolt and a nut provided on the casing, the bolt penetrates the nut and is threadedly connected therewith, and one end of the bolt extends into the casing to support the lower part of the pressing plate.

Further, the housing includes a vertical part and an inclined part that are connected as a whole, the vertical part is connected with the hopper, and the inclined angle of the inclined part and the horizontal plane is 30-60°.

Further, it also includes a base, the base includes a support rod and a support base, the support base is provided with a mounting hole, the support rod is fixed on the support base, and the upper end of the support rod is connected to the housing .

Further, the adjusting device includes a conveying pipe, an impeller, a first hydraulic telescopic rod, a second hydraulic telescopic rod, a one-way valve and a bypass valve, and the feeding end of the conveying pipe is communicated with the discharging port of the hopper, so The rocker drives the impeller to rotate through the transmission system and drives the periodic opening and closing of the bypass valve. The impeller is arranged on the side wall of the conveying pipe and is used to drive the walnuts down from the discharge port of the conveying pipe one by one. To discharge, a plurality of the first hydraulic telescopic rods communicate with each other and surround the discharge port of the conveying pipe. The first hydraulic telescopic rods communicate with the second hydraulic telescopic rods through a one-way valve and a bypass valve respectively. One end of the second hydraulic telescopic rod is rotatably connected with the casing, and the other end is rotatably connected with the pressing plate. The upper end of the pressing plate is rotatably connected with the casing through a connecting shaft. Spring that turns upwards.

Further, an opening is provided on one side of the conveying pipe, the impeller includes a runner and a blade, the runner is arranged at the opening, the number of the blades is 3, and the blades are equally spaced along the circumferential direction. It is fixed on the runner, and the plane where the blades are located is parallel to the axis of the runner.

Further, the bypass valve includes a valve body, a valve core and a rotating shaft. The two ends of the valve body are provided with liquid inlet and outlet ports, and the middle part is provided with a spherical cavity communicating with the liquid inlet and outlet ports. There is the valve core, the valve core is spherical and provided with through holes penetrating both ends, the rotating shaft is fixedly connected with the valve core, and one end of the rotating shaft extends out of the valve body.

Further, the transmission system includes a first pulley, a second pulley, a third pulley, a tower pulley, a first belt, a second belt and a third belt, the first pulley is fixedly connected with the rocker, the The second pulley is fixedly connected to the impeller, the third pulley is connected to the rotating shaft of the bypass valve, the tower pulley includes a large pulley and two small pulleys, the first belt is wound around the first pulley and the large pulley On the pulley, the second pulley is wound around one small pulley and the second pulley, and the third belt is wound around the other small pulley and the third pulley.

The beneficial effects of the present invention are:

Put the walnuts to be shelled into the hopper, the discharge port under the hopper is connected to the shell, and the walnuts to be shelled come out through the discharge port of the hopper and enter the shell. The extruding device is located below the discharge port of the hopper, and the walnuts squeezed into the shell enter the channel of the extruding device for extruding the walnuts, and the extruding device is used for extruding the walnuts to remove the walnuts. During the extrusion process, manually rotate the rocker handle of the rocker, the extrusion roller and the rocker are fixedly connected, thereby driving the extrusion roller to rotate, and a channel for extruding walnuts is formed between the extrusion roller and the extrusion plate, and the walnuts pass through the channel. When squeezed by squeeze rollers and squeeze plates, the walnuts are shelled. The extrusion plate is rotatably connected with the casing, and the casing is provided with an adjustment device for driving the rotation of the extrusion plate, and the rotation angle of the extrusion plate is adjusted by the adjustment device, thereby adjusting the distance between the extrusion plate and the extrusion roller, Thereby, the width of the channel for extruding walnuts can be adjusted, so that the hand-operated walnut shelling machine can be adapted to walnuts of different sizes.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only preferred embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

1 is a schematic diagram of the three-dimensional structure of a single-roller adjustable hand-cranked walnut sheller according to Embodiment 1 of the present invention;

2 is a schematic cross-sectional structural diagram of the extrusion device and the adjustment device according to Embodiment 1 of the present invention;

3 is a schematic three-dimensional structure diagram of the extrusion device according to Embodiment 1 of the present invention;

4 is a schematic cross-sectional structural diagram of the extrusion device and the adjustment device according to Embodiment 2 of the present invention;

5 is a schematic cross-sectional structural diagram of a bypass valve according to Embodiment 2 of the present invention;

6 is a schematic diagram of the connection between the first hydraulic telescopic rod and the second hydraulic telescopic rod according to Embodiment 2 of the present invention;

In the figure, 1 shell, 2 hopper, 3 extrusion device, 4 extrusion plate, 5 extrusion roller, 6 rocker, 7 adjustment device, 8 groove, 9 fillet, 10 bolt, 11 nut, 12 vertical part , 13 inclined part, 14 base, 15 support rod, 16 support seat, 17 delivery pipe, 18 impeller, 19 first hydraulic telescopic rod, 20 second hydraulic telescopic rod, 21 one-way valve, 22 bypass valve, 23 opening, 24 blades, 25 runners, 26 valve bodies, 27 valve cores, 28 shafts, 29 inlet and outlet ports, 30 through holes, 31 first pulleys, 32 second pulleys, 33 third pulleys, 34 tower pulleys, 35 first belts , 36 second belt, 37 third belt, 38 large pulley, 39 small pulley.

detailed description

In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described with reference to the accompanying drawings.

Example 1

Referring to Figures 1 to 3, a single-roll adjustable hand-cranked walnut sheller includes a casing 1, a hopper 2 and a pressing device 3, the casing 1 is communicated with the hopper 2, and the pressing device 3 is provided with In the outer box and below the discharge port of the hopper 2, the extrusion device 3 includes a extrusion plate 4, a extrusion roller 5 and a rocker 6, and the extrusion roller 5 and the rocker 6 are fixedly connected, The pressing plate 4 and the rocker 6 are respectively connected in rotation with the casing 1, a channel for squeezing walnuts is formed between the pressing roller 5 and the pressing plate 4, and the casing 1 is provided with a drive to drive the pressing. The plate 4 is rotated towards or away from the adjustment device 7 in the direction of the squeeze rollers. Put the walnuts to be shelled into the hopper 2, the discharge port under the hopper 2 is connected to the shell 1, and the walnuts to be shelled come out through the discharge port of the hopper 2 and enter the shell 1. The outer shell 1 is provided with an extrusion device 3, and the extrusion device 3 is located below the discharge port of the hopper 2. The walnuts squeezed into the outer shell 1 enter the channel of the extrusion device 3 for extruding walnuts, and the extrusion device 3 is used for extruding walnuts. Shell the walnuts. The squeezing device 3 includes a squeezing plate 4, a squeezing roller 5 and a rocker 6. During the squeezing process, the rocker of the rocker 6 is manually rotated, and the squeezing roller 5 and the rocker 6 are fixedly connected, thereby driving the squeezing roller 5 is rotated, a channel for squeezing walnuts is formed between the squeezing roller 5 and the squeezing plate 4, and the walnuts are squeezed by the squeezing roller 5 and the squeezing plate 4 when passing through the channel, thereby removing the walnuts. The extrusion plate 4 is rotatably connected with the casing 1. The casing 1 is provided with an adjustment device 7 that drives the extrusion plate 4 to rotate. The distance between the squeezing rollers 5 is adjusted to adjust the channel width for squeezing walnuts, so that the hand-operated walnut shelling machine can adapt to different sizes of walnuts. One end of the adjusting device 7 can be connected to the casing 1 , and the other end supports the pressing plate 4 , and the rotation angle of the pressing plate 4 is driven by the expansion and contraction of the adjusting device 7 .

Specifically, the pressing plate 4 is in the shape of an inclined square step, the rotation axis of the pressing roller 5 is parallel to the step of the pressing plate 4, and the pressing roller 5 has a rounded edge 9. A square cylinder, the side of the square cylinder is provided with a groove 8 with an inclined bottom, the depth of the bottom of the groove 8 is gradually reduced along the rotation direction of the extrusion roller 5 when the walnut is squeezed, and the length of the groove 8 The same length as the square cylinder. The walnuts fall from the hopper 2 and then fall onto the extrusion plate 4. The extrusion plate 4 is in the shape of an inclined square step. The walnuts fall down along the extrusion plate 4 into the channel for extruding walnuts. The extrusion roller 5 is a rib. A square cylinder with rounded corners 9 on the side, the side of the square cylinder is provided with a groove 8 with an inclined bottom, and the depth of the bottom of the groove 8 gradually decreases along the rotation direction of the extrusion roller 5 when squeezing the walnut. When the roller rotates, the edge of the groove 8 catches the walnut, and the roller is continuously and slowly rotated to squeeze and remove the shell 1 on the edge of the walnut, which can effectively remove the walnut shell 1, and is not easy to smash the walnut.

Specifically, the adjusting device 7 includes a connecting bolt 10 and a nut 11 provided on the casing 1 , the bolt 10 penetrates the nut 11 and is threadedly connected with it, and one end of the bolt 10 extends into the casing 1 to support the below the extrusion plate 4. Rotating the bolt 10 can adjust the length of the bolt 10 extending into the housing 1 , thereby adjusting the angle at which the pressing plate 4 is pushed to rotate. In the process of extruding the walnuts to remove the shells, the pressing plate 4 is pressed on the bolts 10 when rotated by the pressing force, the supporting force of the bolts 10 is stable, and the walnuts are stably removed. The adjusting device 7 is composed of only a small number of components and has a simple structure.

Specifically, the housing 1 includes a vertical portion 12 and an inclined portion 13 that are integrally connected, the vertical portion 12 is connected to the hopper 2 , and the inclined portion 13 is inclined at an angle of 30-60° to the horizontal plane. The shelled walnuts fall out from the inclined part 13 in the shell 1, and a receiving bucket can be placed under the inclined part 13 to catch the shelled walnuts.

Specifically, it also includes a base 14, the base 14 includes a support rod 15 and a support base 16, the support base 16 is provided with a mounting hole, the support rod 15 is fixed on the support base 16, the support rod The upper end of 15 is connected to the casing 1 . It is convenient for installation and placement of the device, and improves the fixation and stability of the device. Increase the height of the unit to facilitate the collection of walnuts after shelling.

Example 2

4 to 5 , the difference between this embodiment and Embodiment 1 is that the adjusting device 7 includes a conveying pipe 17 , an impeller 18 , a first hydraulic telescopic rod 19 , a second hydraulic telescopic rod 20 , a one-way valve 21 and a side Through valve 22, the feed end of the conveying pipe 17 is communicated with the discharge port of the hopper 2, the rocker 6 drives the impeller 18 to rotate through the transmission system and drives the periodic opening and closing of the bypass valve 22 , the impeller 18 is arranged on the side wall of the conveying pipe 17 to drive the walnuts to be discharged one by one from the outlet of the conveying pipe 17 , and a plurality of the first hydraulic telescopic rods 19 communicate with each other and surround the conveying pipe 17 The first hydraulic telescopic rod 19 communicates with the second hydraulic telescopic rod 20 through the one-way valve 21 and the bypass valve 22 respectively, and one end of the second hydraulic telescopic rod 20 is rotatably connected to the casing 1, The other end is rotatably connected to the pressing plate 4 , and the upper end of the pressing plate 4 is rotatably connected to the casing 1 through a connecting shaft. The casing 1 is provided with a spring that pushes the pressing plate 4 to rotate upward.

The cross section of the conveying pipe 17 allows walnuts to pass through. An impeller 18 is arranged in the conveying pipe 17. When the rocker 6 rotates, the impeller 18 is driven to rotate by the transmission system and drives the periodic opening and closing of the bypass valve 22. When the impeller 18 rotates, the blades 24 push the walnuts to move down along the conveying pipe 17 , and the two blades 24 move downward with the walnuts sandwiched one behind the other. A plurality of the first hydraulic telescopic rods 19 communicate with each other and surround the discharge port of the conveying pipe 17 . The first hydraulic telescopic rods 19 are in an extended state in a natural state. When the walnuts pass through the first hydraulic telescopic rods 19 Pushing the first hydraulic telescopic rod 19 to shorten, the larger the diameter of the walnut, the greater the shortened distance of the first hydraulic telescopic rod 19, and therefore the greater the amount of hydraulic oil delivered to the second hydraulic telescopic rod 20, so that the second hydraulic telescopic rod 20 is stretched. The longer the length of the second hydraulic telescopic rod 20 is, one end of the second hydraulic telescopic rod 20 is rotatably connected with the housing 1, and the other end is rotatably connected with the pressing plate 4. When the second hydraulic telescopic rod 20 is extended, the pressing plate 4 is kept away from the Squeeze roll 5 to increase the squeeze channel. The adjusting device 7 can adjust the position of the extrusion plate 4 according to the diameter of the walnut. When the diameter of the walnut is large, the extrusion channel of the walnut is automatically adjusted to increase, and the extrusion channel of the walnut is reduced when the diameter of the walnut is small. The bypass valve 22 and the impeller 18 are driven by the same power source, which is convenient to control the opening and closing time of the valve corresponding to the rotational position of the impeller 18 . When the impeller 18 rotates to push the walnut into contact with the first hydraulic telescopic rod 19, the bypass valve 22 is opened so that the hydraulic oil of the second hydraulic telescopic rod 20 flows back to the first hydraulic telescopic rod 19. The bypass valve 22 is in a closed state from the rod 19 to the next walnut contacting the first hydraulic telescopic rod 19 . When the bypass valve 22 is closed, the hydraulic oil can flow from the one-way valve 21 to the second hydraulic telescopic rod 20 but cannot flow backwards, and is fixed firmly after the rotation angle of the squeeze plate 4 is adjusted. After the shelling of the walnuts is completed, the next walnut enters the position in contact with the first hydraulic telescopic rod 19, and the above steps are repeated until all the walnuts are shelled. A plurality of adjusting devices 7 can be arranged at the bottom of the hopper 2 to perform multi-thread processing and improve the processing efficiency. The casing 1 is provided with a spring that pushes the pressing plate 4 to rotate upwards. One end of the spring is connected to the pressing plate 4 and the other end is connected to the casing 1. The spring pushes the pressing plate 4 to restore stability.

Specifically, an opening 23 is provided on one side of the conveying pipe 17 , the impeller 18 includes a runner 25 and blades 24 , the runner 25 is arranged at the opening 23 , and a part of the blades 24 of the impeller 18 is located in the conveying pipe 17 The other part is outside the conveying pipe 17, the number of the blades 24 is 3, the blades 24 are fixed on the runner 25 at equal intervals in the circumferential direction, and the plane where the blades 24 are located is the axis of the runner 25. Hearts are parallel. The included angle between the blades 24 is 120 degrees, and 3 walnuts are pushed downward every one rotation, and the walnut output interval is constant, which is convenient for control.

Specifically, the bypass valve 22 includes a valve body 26 , a valve core 27 and a rotating shaft 28 . The two ends of the valve body 26 are provided with liquid inlet and outlet ports 29 , and the middle portion is provided with a spherical cavity communicating with the liquid inlet and outlet ports 29 . , the spherical cavity is provided with the valve core 27, the valve core 27 is spherical and has through holes 30 penetrating both ends, the rotating shaft 28 is fixedly connected with the valve core 27, and one end of the rotating shaft 28 extends out of the valve body 26. When the rotating shaft 28 rotates, the valve core 27 is driven to rotate. When the valve core 27 rotates so that the through hole 30 is aligned with the liquid inlet and outlet 29 , the bypass valve 22 forms a passage, and the second hydraulic telescopic rod 20 returns to the first hydraulic telescopic rod 19 . One end of the rotating shaft 28 protrudes out of the valve body 26 , so that the rotating shaft 28 can be easily operated to drive the valve core 27 to rotate. The valve core 27 is in contact with the inner wall of the spherical cavity.

Specifically, the transmission system includes a first pulley 31 , a second belt 36 pulley 32 , a third belt 37 pulley 33 , a tower pulley 34 , a first belt 35 , a second belt 36 and a third belt 37 . The pulley 31 is fixedly connected with the rocker 6 , the second belt 36 pulley 32 is fixedly connected with the impeller 18 , the third belt 37 pulley 33 is connected with the rotating shaft 28 of the bypass valve 22 , the tower The pulley includes a large pulley 38 and two small pulleys 39, the first belt 35 is wound around the first pulley 31 and the large pulley 38, and the second belt 36 pulley 32 is wound around a small pulley 39 and the second belt 36 pulley 32, the third belt 37 is wound around another small pulley 39 and the third belt 37 pulley 33. The size of the large pulley 38 and the small pulley 39 means that the diameter of the large pulley 38 is larger than the diameter of the small pulley 39 . When the rocker 6 rotates, it drives the first pulley 31 to rotate, and the first pulley 31 drives the tower pulley to rotate through the first belt 35. The diameter of the first pulley 31 is smaller than the diameter of the large pulley 38 of the tower wheel. The large pulley 38 and the small pulley on the tower wheel 39 rotates synchronously, the diameter of the large pulley 38 is larger than the diameter of the small pulley 39, and then driving the second belt 36 pulley 32 and the third belt 37 pulley 33 through the small pulley 39 can reduce the output speed. The two small pulleys 39 on the tower wheel have the same diameter, and the second belt 36 pulley 32 and the third belt 37 pulley 33 are respectively driven by the small pulleys 39 to rotate. Thereby, the shaft 28 and the impeller 18 of the valve are driven to rotate.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims

A single-roller adjustable hand-cranked walnut sheller, comprising a shell, a hopper and an extrusion device, the shell is communicated with the hopper, and the extrusion device is arranged in an outer box and below the discharge port of the hopper , characterized in that the pressing device comprises a pressing plate, a pressing roller and a rocker, the pressing roller and the rocker are fixedly connected, and the pressing plate and the rocker are respectively rotatably connected to the casing A channel for squeezing walnuts is formed between the squeezing roller and the squeezing plate, and the casing is provided with an adjusting device that drives the squeezing plate to rotate toward or away from the squeezing roller.
The single-roller adjustable hand-cranked walnut sheller according to claim 1, wherein the pressing plate is in the shape of an inclined square step, and the rotation axis of the pressing roller is connected to the pressing plate. The steps are parallel to each other, the extrusion roller is a square cylinder with rounded edges, and the side of the square cylinder is provided with a groove with an inclined bottom, and the bottom of the groove is pressed along the depth of the walnut when squeezing the walnut. The rotation direction of the pressing roller gradually decreases, and the length of the groove is the same as that of the square cylinder.
A single-roller adjustable hand-cranked walnut sheller according to claim 1, wherein the adjusting device comprises a connecting bolt and a nut provided on the casing, the bolt passing through the nut and being connected with the nut. One end of the bolt extends into the casing to support the bottom of the squeeze plate.
The single-roll adjustable hand-cranked walnut sheller according to claim 1, wherein the shell comprises a vertical part and an inclined part that are connected as a whole, and the vertical part is connected with the hopper , the inclination angle between the inclined portion and the horizontal plane is 30° to 60°.
The single-roller adjustable hand-operated walnut sheller according to claim 1, further comprising a base, the base comprising a support rod and a support seat, and the support seat is provided with a mounting hole, so The support rod is fixed on the support base, and the upper end of the support rod is connected with the housing.
The single-roller adjustable hand-operated walnut sheller according to claim 1, wherein the adjusting device comprises a conveying pipe, an impeller, a first hydraulic telescopic rod, a second hydraulic telescopic rod, and a one-way valve and a bypass valve, the feed end of the conveying pipe is communicated with the discharge port of the hopper, the rocker drives the impeller to rotate through the transmission system and drives the periodic opening and closing of the bypass valve, the impeller Set on the side wall of the conveying pipe to drive the walnuts downward one by one to be discharged from the discharge port of the conveying pipe. Several of the first hydraulic telescopic rods communicate with each other and surround the discharge port of the conveying pipe. The hydraulic telescopic rod is communicated with a second hydraulic telescopic rod through a one-way valve and a bypass valve, one end of the second hydraulic telescopic rod is rotatably connected with the casing, and the other end is rotatably connected with the pressing plate. The upper end of the plate is rotatably connected with the casing through a connecting shaft, and a spring is arranged in the casing to push the pressing plate to rotate upward.
The single-roller adjustable hand-operated walnut sheller according to claim 6, wherein an opening is provided on one side of the conveying pipe, the impeller comprises a runner and a blade, and the runner is arranged on the At the opening, the number of the blades is 3, the blades are fixed on the runner at equal intervals along the circumferential direction, and the plane where the blades are located is parallel to the axis of the runner.
The single-roll adjustable hand-cranked walnut sheller according to claim 6, wherein the bypass valve comprises a valve body, a valve core and a rotating shaft, and both ends of the valve body are provided with liquid inlet and outlet A spherical cavity communicated with the liquid inlet and outlet is provided in the middle, and the valve core is arranged in the spherical cavity. The core is fixedly connected, and one end of the rotating shaft extends out of the valve body.
The single-roller adjustable hand-operated walnut sheller according to claim 8, wherein the transmission system comprises a first pulley, a second pulley, a third pulley, a tower wheel, a first belt, a Two belts and a third belt, the first pulley is fixedly connected to the rocker, the second pulley is fixedly connected to the impeller, the third pulley is connected to the shaft of the bypass valve, the tower The pulley includes a large pulley and two small pulleys, the first belt is wound on the first pulley and the large pulley, the second pulley is wound on one small pulley and the second pulley, and the third belt is wound on the other small pulley and on the third pulley.